Relevant bibliographies by topics / Wind quartets

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Wind quartets'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Wind quartets"

1

Barkin, Elaine, Arthur Berger, and Milton Babbitt. "Quartet for Winds." American Music 7, no. 3 (1989): 351. http://dx.doi.org/10.2307/3052090.

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Hwang, Paul A., Yalin Fan, Francisco J. Ocampo-Torres, and Héctor García-Nava. "Ocean Surface Wave Spectra inside Tropical Cyclones." Journal of Physical Oceanography 47, no. 10 (October 2017): 2393–417. http://dx.doi.org/10.1175/jpo-d-17-0066.1.

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AbstractDirectional wave spectra acquired in hurricane reconnaissance missions are compared with wind-wave spectral models. The comparison result is quantified with two indices of model–measurement spectral agreement. In the main region of hurricane coverage, the indices vary sinusoidally with the azimuth angle referenced to the hurricane heading while showing a weak dependence on the radial distance from the hurricane center. The measured spectra agree well with three models evaluated in the back and right quarters, and they are underdeveloped in the front and left quarters. The local wind and wave directions also show a weak radial dependence and sinusoidal variation along the azimuth. The wind and wave vectors are almost collinear in the back and right quarters; they diverge azimuthally and become almost perpendicular in the left quarter. The azimuthally cyclical correlation between the indices of spectral agreement and the wind-wave directional difference is well described by the sinusoidal variations. Also discussed is the wide range of the spectral slopes observed in both hurricane and nonhurricane field data. It is unlikely that the observed spectral slope variation is caused by Doppler frequency shift from background currents. No clear correlation is found between spectral slope and various wind and wave parameters. The result suggests that the spectral slope needs to be treated as a stochastic random variable. Complementing the existing wind-wave spectral models that prescribe a fixed spectral slope of either −4 or −5, a general spectral model with its spectral parameters accommodating a variable spectral slope is introduced.
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Shields, Julia, and Kirsty Murray. "Bridie's Fire, Children of the Wind Quartet, Volume 1." Labour History, no. 89 (2005): 268. http://dx.doi.org/10.2307/27516105.

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Katz, J., and L. Dykstra. "Effect of Passenger Car’s Rear Deck Geometry on Its Aerodynamic Coefficients." Journal of Fluids Engineering 114, no. 2 (June 1, 1992): 186–90. http://dx.doi.org/10.1115/1.2910014.

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The effects of aerodynamic modifications near the rear deck of a passenger-car based race car were investigated experimentally. The modifications were evaluated on a quarter-scale wind tunnel model and included a rear spoiler and a wing. The experimental results indicate that these devices alter the flow field on the vehicle’s body resulting in considerable negative lift coefficients. Also, this aerodynamic interaction is sensitive to rear wing location and when properly placed the total lift owing to the rear wing, combined with its effect on the vehicle’s body, can amount to twice the lift of the isolated wing.
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Vatamaniuk, Nataliia. "DEFINITION OF THE INTRA QUARTER SPACES AND THEIR FUNCTIONS IN THE PLANNING STRUCTURE OF HISTORICAL CITIES." Current problems of architecture and urban planning, no. 58 (November 30, 2020): 48–55. http://dx.doi.org/10.32347/2077-3455.2020.58.48-55.

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The article gives the definition of intra quarter spaces using the example of the historical city of Chernivtsi. The main functions of residential courtyards as elements of the urban planning structure are determined. To define the concept of «intra quarter space», we can turn to several foreign and domestic researchers, architects, city planners. For example, the theorist and architect A. Gutnov characterized the yard as a clearly fixed, closed space. Courtyards were connected by arches or through passages, forming a complex system of intra quarter spaces, which in some cases penetrated large areas of the city [3]. Architect R. Krier in his works on the morphology of urban space defined the interior spaces of historic quarters as protected from the weather and the environment of the territory, which became the appropriate symbols of the private sphere of life [12]. Summarizing all the above statements, we can give a general definition for «intra quarter spaces», that it is an independent, complex-functional structure that provides communication: the house – the courtyard – urban areas. Exploring the intra quarters of the city of Chernivtsi, we can identify the following functions of the courtyards: insulating function, which serves as protection against unplanned intrusion of «strangers» or vehicles into the yard; household function, which includes meeting the needs of residents of nearby houses; trade function, is the creation in the volumes of the first floors of various commercial premises; the function of communication, which plays a socio-psychological role of adaptation of residents to the urban environment; sanitary and hygienic function, including landscaping, the need for insolation, wind and snow protection of the courtyard, etc. aesthetic function that provides visual comfort from objects of small architectural forms, landscaping (lawns, flower beds), murals on empty walls, etc. game function and sports and health function.
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Rosén, Mikael, and Anders Hedenström. "Soaring Flight in the Eleonora's Falcon (Falco eleonorae)." Auk 119, no. 3 (July 1, 2002): 835–40. http://dx.doi.org/10.1093/auk/119.3.835.

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Abstract Eleonora's Falcon (Falco eleonorae) breeds in the Mediterranean region and is highly adapted for catching small birds on passage migration between Eurasia and their African winter quarters, which they feed their young. We studied gliding flight behavior of Eleonora's Falcon at a breeding colony located on a small island southwest of Sardinia, Italy. Gliding and soaring flight performance was measured using an optical range finder and evaluated against flight mechanical theory. The male falcon does the majority of hunting and usually sets off from the colony to hunting areas located at high altitude over the open sea to catch prey. To lower the cost of transport and maximize the energy gain from hunting, we show that the birds use vertical winds for soaring when available. The occurrence of rising air changes with wind direction. At north-northwesterly winds (on-shore), slope lift is available outside the nesting cliffs, and at south-southeasterly winds thermals that form over the island drift out over the sea. Our observations demonstrated the flexibility of flight behavior in relation to the wind situation, and birds thereby make full use of available soaring conditions.
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Ardhuin, Fabrice, T. H. C. Herbers, Kristen P. Watts, Gerbrant Ph van Vledder, R. Jensen, and Hans C. Graber. "Swell and Slanting-Fetch Effects on Wind Wave Growth." Journal of Physical Oceanography 37, no. 4 (April 1, 2007): 908–31. http://dx.doi.org/10.1175/jpo3039.1.

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Abstract Wind-sea generation was observed during two experiments off the coast of North Carolina. One event with offshore winds of 9–11 m s−1 directed 20° from shore normal was observed with eight directional stations recording simultaneously and spanning a fetch from 4 to 83 km. An opposing swell of 1-m height and 10-s period was also present. The wind-sea part of the wave spectrum conforms to established growth curves for significant wave height and peak period, except at inner-shelf stations where a large alongshore wind-sea component was observed. At these short fetches, the mean wave direction θm was observed to change abruptly across the wind-sea spectral peak, from alongshore at lower frequencies to downwind at higher frequencies. Waves from another event with offshore winds of 6–14 m s−1 directed 20°–30° from shore normal were observed with two instrument arrays. A significant amount of low-frequency wave energy was observed to propagate alongshore from the region where the wind was strongest. These measurements are used to assess the performance of some widely used parameterizations in wave models. The modeled transition of θm across the wind-sea spectrum is smoother than that in the observations and is reproduced very differently by different parameterizations, giving insights into the appropriate level of dissipation. Calculations with the full Boltzmann integral of quartet wave–wave interactions reveal that the discrete interaction approximation parameterization for these interactions is reasonably accurate at the peak of the wind sea but overpredicts the directional spread at high frequencies. This error is well compensated by parameterizations of the wind input source term that have a narrow directional distribution. Observations also highlight deficiencies in some parameterizations of wave dissipation processes in mixed swell–wind-sea conditions.
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Katz, J., and R. Largman. "Experimental Study of the Aerodynamic Interaction Between an Enclosed-Wheel Racing-Car and Its Rear Wing." Journal of Fluids Engineering 111, no. 2 (June 1, 1989): 154–59. http://dx.doi.org/10.1115/1.3243616.

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A quarter-scale model of an enclosed wheel racing car was tested using the elevated ground plane wind tunnel technique. To increase the aerodynamic down force, two longitudinal underbody channels were built into the vehicle’s lower surface, and a rear wing was added. The effect of these underbody channels, and of wing angle of attack and position, on the vehicle’s drag and down force was experimentally investigated. Results of the experiments indicate that the flow under the car is affected by the presence of the wheels, and the vehicle without a rear wing generates only a negligible downforce. However, the addition of a rear wing enhanced the flow under the vehicle body, resulting in an increased aerodynamic downforce.
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Hwang, Paul A., and Edward J. Walsh. "Propagation Directions of Ocean Surface Waves inside Tropical Cyclones." Journal of Physical Oceanography 48, no. 7 (July 2018): 1495–511. http://dx.doi.org/10.1175/jpo-d-18-0015.1.

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AbstractSurface wave propagation inside tropical cyclones (TCs) is complicated and multiple wave systems are frequently observed. The directional wave spectra acquired by hurricane hunters are analyzed to quantify its azimuthal and radial variations. Referenced to the hurricane heading, the dominate feature in the front half of the TC coverage area is single wave systems propagating toward left and left-front. Multiple wave systems are generally observed in the back and right quarters outside the radius of maximum wind (RMW). The directional differences and locations of occurrences of multisystem spectra are Gaussian distributed. The directional differences of the secondary and tertiary wave systems from the primary system are centered around 60°–70°. The minor systems are more likely on the left-hand side of the primary system than on the right-hand side by a 3-to-1 ratio. The most likely azimuthal location of multisystem spectra is about 210° counterclockwise from the heading. In the right-front quarter, waves propagate into the advancing wind field and experience extended air–sea exchanges to grow higher and longer; in the left-rear quarter, they propagate away from the advancing wind field and are more likely younger seas. The radial variation of wave propagation is relatively minor except inside the RMW. A model describing the dominant wave propagation direction is presented. The regression statistics between modeled and measured wave directions show consistent agreement in 9 of the 11 datasets available for investigation. Causes for the significantly different statistics of the two remaining datasets include proximity to coast (a landfalling case) and rapid change in the hurricane translation speed or direction.
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Roberts, LS, MV Finnis, and K. Knowles. "Modelling boundary-layer transition on wings operating in ground effect at low Reynolds numbers." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 11 (October 25, 2018): 2820–37. http://dx.doi.org/10.1177/0954407018804007.

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The transition-sensitive, three-equation k- kL- ω eddy-viscosity closure model was used for simulations of three-dimensional, single-element and multi-element wing configurations operating in close proximity to the ground. The aim of the study was to understand whether the model correctly simulated the transitional phenomena that occurred in the low Reynolds number operating conditions and whether it offered an improvement over the classical fully turbulent k-ω shear stress transport model. This was accomplished by comparing the simulation results to experiments conducted in a 2.7 m × 1.7 m closed-return, three-quarter-open-jet wind tunnel. The model was capable of capturing the presence of a laminar separation bubble on the wing and predicted sectional forces and surface-flow structures generated by the wings in wind tunnel testing to within 2.5% in downforce and 4.1% in drag for a multi-element wing. It was found, however, that the model produced insufficient turbulent kinetic energy during shear-layer reattachment, predicted turbulent trailing-edge separation prematurely in areas of large adverse pressure gradients, and was found to be very sensitive to inlet turbulence quantities. Despite these deficiencies, the model gave results that were much closer to wind-tunnel tests than those given by the fully turbulent k-ω shear stress transport model, which tended to underestimate downforce. Significant differences between the transitional and fully turbulent models in terms of pressure field, wake thickness and turbulent kinetic energy production were found and highlighted the importance of using transitional models for wings operating at low Reynolds numbers in ground effect. The k- kL- ω model has been shown to be appropriate for the simulation of separation-induced transition on a three-dimensional wing operating in ground effect at low Reynolds number.
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Dissertations / Theses on the topic "Wind quartets"

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Tan, Anthony. "--then time killed the wind-- : for percussion quartet and live electronics." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116055.

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...then time killed the wind... is an original musical composition scored for percussion quartet and electronics with a duration of fourteen minutes. This work explores metaphorical relationships between biological processes and musical processes. The primary constructive element in the work is a rhythmic language based upon the assignment of rhythmic cells to genetic sequences. Furthermore, biological models such as inverted repeats, zeitgeber, 2-D representations of DNA and cross-breeding were applied to musical parameters such as form, pitch, harmony and live electronics.
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Ellison, Timothy Lee. "An analysis of Joel Puckett's Short Stories| A concerto for string quartet and wind ensemble." Thesis, The University of North Carolina at Greensboro, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3722514.

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ELLISON, TIMOTHY LEE, D.M.A. An Analysis of Joel Puckett's Short Stories: A Concerto for String Quartet and Wind Ensemble. (2014) Directed by Drs. John R. Locke and Kevin M. Geraldi. 33 pp. The purpose of this study is to examine Joel Puckett's work, Short Stories, a new concerto for string quartet and wind ensemble. Composed for the University of North Carolina at Greensboro Wind Ensemble and premiered at the 2013 National Convention of the College Band Directors National Association, this document provides insight and background information to future performers and conductors through research, analysis, and first-hand experience from the commission to the premiere. The research method was designed to present original research and scholarship on Short Stories, addressing three main areas: the background of Short Stories and the compositional process, a formal analysis, and conclusions. The uniqueness of Short Stories lies in its construction and emphasis on pairs. Puckett utilizes pairs in a powerful way in Short Stories. The pairing of a string quartet and wind ensemble, pairing each of the eight movements - four pairs, and the individual and intimate atmosphere created by the use of pairs, all speak to the overarching duality contained within the composition.

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Puckett, James L. "Part I: Concerto for Percussion Quartet and Wind EnsemblePart II: The Compositional Technique of Joseph Schwantner as presented in LUMINOSITY "Concerto for Wind Orchestra"." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1554805885529634.

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Peersen, Hild Breien. "Franz Berwald's Quartet for piano and winds its historical, stylistic, and social context /." Connect to resource, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1104257313.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xii, 151 p.; also includes graphics. Includes bibliographical references (p. 147-151). Available online via OhioLINK's ETD Center
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Shouha, Laura. "The Musical Language of Joan Tower: An Energy Line Analysis of Island Prelude for Oboe and Wind Quartet." Thesis, connect to online resource, 2001. http://www.library.unt.edu/theses/open/20013/shouha%5Flaura/index.htm.

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Peersen, Hild Breien. "Franz Berwald and his quartet for piano and winds: its historical, stylistic, and social context." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1104257313.

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"A portfolio of music compositions." Thesis, 2004. http://library.cuhk.edu.hk/record=b6073653.

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Alien-colour : for woodwind quintet -- Two bagatelles for the solo piano -- Duodecat : for large ensemble -- Moonlight : for solo voice and percussion -- Activation : for orchestra.
Yang Jin Fong.
"June 2004."
Thesis (D.Mus.)--Chinese University of Hong Kong, 2004.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
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Hendricks, Jess. "Wandering into the Dusky Plains for Winds, Percussion, and String Quartet." 2007. http://etd.utk.edu/2007/HendricksJess.pdf.

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"A portfolio of music compositions." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075468.

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Dead water : song cycle for tenor and piano -- Shan shui : for string quartet -- Kuang fu : for SSAAATTBB and yangqin -- If life is unknown : for wind quintet -- Symphony II : Marrison for chamber orchestra, male choir, erhu and zheng -- Jazzy illusion of a Chinaman : for clarinet/bass clarinet, piano/electric keyboard, electric guitar, drum set, cello and double bass -- Liao Zhai : Chinese strange tale for recorders , percussions, soprano, tenor and baritone -- A madman's diary : piano solo work.
Tam, Chin Fai.
Thesis (D.Mus.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references (leaves 391-392).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong , [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese; includes in Chinese.
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Goodner, Robert Lynn. "Chamber music featuring trumpet in three different settings with voice, with woodwinds, with strings." 2007. http://hdl.handle.net/1903/9729.

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Books on the topic "Wind quartets"

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Kraft, Leo. Five short pieces: For wind quartet, 1997. New York, NY: Seesaw Music Corp., 1998.

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Last waltz on wild horse: A western quartet. Thorndike, Maine: Center Point Large Print, 2016.

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Schafer, R. Murray. String quartet no. 6: Parting wild horse's mane. Indian River, ON: Arcana Eds., 2004.

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Last waltz on wild horse: A Western quartet. Waterville, Me: Five Star, 2008.

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Butterworth, George. Love blows as the wind blows: For voice and string quartet. Boca Raton, Fla: Masters Music Publications, 1998.

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translator, Naqvi Tahira, ed. A Chughtai quartet: The heart breaks free, the wild one, obsession, wild pigeons. New Delhi: Women Unlimited, 2014.

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Mineck, Raymond E. Wind-tunnel investigation of aerodynamic efficiency of three planar ellipyical wings with curvature of quarter-chord line. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Mineck, Raymond E. Wind-tunnel investigation of aerodynamic efficiency of three planar elliptical wings with curvature of quarter-chord line. Hampton, Va: Langley Research Center, 1993.

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Mineck, Raymond E. Wind-tunnel investigation of aerodynamic efficiency of three planar ellipyical wings with curvature of quarter-chord line. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Mineck, Raymond E. Wind-tunnel investigation of aerodynamic efficiency of three planar ellipyical wings with curvature of quarter-chord line. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1993.

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Book chapters on the topic "Wind quartets"

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Yang, Feng, and Liang Chen. "Pedestrian Wind in High-Rise Residential Quarters." In The Urban Book Series, 111–37. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-1714-3_5.

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Kelly, A. A. "The Wing Three-Quarter." In Liam O’Flaherty The Collected Stories, 291–96. New York: Palgrave Macmillan US, 1999. http://dx.doi.org/10.1007/978-1-137-07257-3_66.

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Li, Ming, Hong Jin, and Teng Shao. "Simulation Analysis and Planning Strategies for the Wind Environment of Residential Quarter in Harbin." In Renewable Energy in the Service of Mankind Vol I, 585–96. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17777-9_53.

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Dickens, Charles. "Third Quarter." In A Christmas Carol and Other Christmas Books. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199536306.003.0011.

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Black are the brooding clouds and troubled the deep waters, when the Sea of Thought, first heaving from a calm, gives up its Dead. Monsters uncouth and wild, arise in premature, imperfect resurrection; the several parts and shapes of different things are joined and...
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Ball, Philip. "1. Aristotle's quartet: the elements in antiquity." In The Elements: A Very Short Introduction, 1–20. Oxford University Press, 2004. http://dx.doi.org/10.1093/actrade/9780192840998.003.0001.

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‘Aristotle's quartet: the elements in antiquity’ outlines how the study of elements progressed from ancient Greece to the seventeenth century. The Aristotelian system of elements claimed that there were four types of matter — earth, wind, fire, and water. After the Dark Ages the medieval Western world held classical science in reverent awe, and differing views were treated as heretical. However, in this system metals were treated as ‘earth’. Alchemy provided a means of investigating metals, concentrating on turning metal into gold. By the end of the seventeenth century Aristotle's ideas were losing traction, and the work of Robert Boyle and John Dalton changed alchemy into chymistry, then into modern chemistry.
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Austen, Jane. "Chapter XIII." In Emma. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199535521.003.0053.

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The weather continued much the same all the following morning; and the same loneliness, and the same melancholy, seemed to reign at Hartfield—but in the afternoon it cleared; the wind changed into a softer quarter; the clouds were carried off; the sun...
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Morrison, Arthur. "Chapter 2." In A Child of the Jago. Oxford University Press, 2012. http://dx.doi.org/10.1093/owc/9780199605514.003.0003.

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Three-quarters of a mile east of the Jago's outermost limit was the East End Elevation Mission and Pansophical Institute:* such was the amazing success whereof, that a new wing had been built, and was now to be declared open by...
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Dickens, Charles. "The Grindstone." In A Tale of Two Cities. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199536238.003.0036.

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Tellson’s Bank, established in the Saint Germain Quarter of Paris,* was in a wing of a large house, approached by a court-yard and shut off from the street by a high wall and a strong gate. The house belonged to a...
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Dostoevsky, Fyodor. "Chapter 10." In Notes from the Underground, and The Gambler. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199536382.003.0024.

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A Quarter of an hour later I was running up and down the room in a state of wild impatience, time and again going up to the screen and peering through the crack at Liza. She was sitting on the floor, leaning her...
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Maltman, Alex. "Sediments and Sedimentary Rocks." In Vineyards, Rocks, and Soils. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190863289.003.0010.

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We are on more familiar ground in this chapter, looking at processes and materials found in the world all around us. Even the names of sedimentary rocks are well known—sandstone, shale, limestone, and so on. Clearly, these materials are highly relevant to vineyard geology because more than three-quarters of the land surface is sedimentary in origin: most of the world’s vineyard areas are underlain by sedimentary rocks. Sediment is the detritus produced from the weathering of already existing rocks. (I explore the process in Chapter 9.) Usually, wind, ice, or water soon moves the debris away, eventually to be deposited and then buried beneath further sediment and with time hardened into sedimentary rock. Weathering can also dissolve material, later to be precipitated. And, needless to say, all the sediment in question here is of geological origin; it has nothing to do with the organic sediment that is thrown, say, in a bottle of vintage port! Wind and flowing water may be able to pick up sediment and move it, depending on the size of the fragments. Faster-moving currents can carry bigger particles: it’s to do with energy, as discussed in the context of rivers in Chapter 8 (see Figure 8.8). The result is sediment sorting. We can easily see the results on a beach—a sandy spot here, a pebbly patch there—because the tides and shore currents have moved the sediment around and sorted it. Thus, most detrital sediments have a characteristic grain size, and we use this to classify the material. The terms for the different sizes are pretty much in line with everyday language: sand, silt, clay, and so on (Figure 5.1). Clay is the finest sediment. It’s composed mainly of the tiny clay minerals that we met in Chapter 3 and has the smooth, slippery feel and handling properties we’re all familiar with; the individual constituent particles are far too fine to see, even with a powerful hand lens. Imagine: if we scaled up a grain of sand to the size of a wine cask, then an individual clay flake would be smaller than a coin.
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Conference papers on the topic "Wind quartets"

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Morton, Scott A., and John E. Nydahl. "Field Tests of a Wind-Electric Controller for Parallel Stock Water Pumping and Heating." In ASME 2002 Wind Energy Symposium. ASMEDC, 2002. http://dx.doi.org/10.1115/wind2002-66.

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Many of the improvements in wind-electric stock water pumping systems are attributable to advanced controller strategies and hardware that maximize performance over a range of wind speeds. The cost of the early and more complex controllers was of the order of one quarter of the whole system. Sophisticated yet inexpensive-programmable micro-controllers are now being introduced that enhance both performance and reliability. This study utilized a micro-programmable logic controller (PLC) to place a variable auxiliary load in the form of a stock water heater in parallel with the pump motor. This improves the system’s economic viability on the Northern High Plains by mitigating stock tank freezing to help extend the grazing season. For the variable auxiliary load, the PLC uses long period pulse width modulation to drive a 3-phase solid-state relay. This continuously variable load strategy was designed to both increase the power factor when the pump is operating, and to extract resistive heating power in wind regimes not suitable for operating the pump. This paper reports on the preliminary but encouraging field studies directed toward optimizing the low wind speed water heating performance of this multi-tasking controller when the pump motor is inoperable.
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Rashidi, Majid, Jaikrishnan R. Kadambi, and Renjie Ke. "Wind Energy Harnessing System for Low and High Wind Speeds." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11995.

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Abstract This work presents the design and analysis of a novel wind energy harnessing system that makes use of wind defecting structures to increase the ambient wind speed at geographic locations with relatively low wind speed. The system however reacts to highspeed wind conditions by altering the profile of the wind defecting structure in order to eliminate wind speed amplification attribute of the system, thereby protecting the wind turbine assembly at high speed wind conditions. Although increasing the wind speed is advantageous at geographic locations that the wind speed is typically low; however, from times to time, there could be sustained high-speed wind conditions at the same locations that may damage the wind turbine systems that take advantage of the wind defecting structures. The present work disclosed a wind deflecting structure formed by at least two sail-like partial cylindrical structures that are supported atop of a tower-like foundation in a symmetric arrangement, where one or more wind turbines can be installed in the space between the two partial cylinders. The two partial cylinders, each substantially in form a quarter cylinder is made of plurality of parallel ribbed-like bars, hereafter referred to as “bars” with a flexible thin material that are mechanically supported by the bars. The bars are oriented in a direction perpendicular to the ground; allowing the wing deflecting structures to accept horizonal axis or vertical axis turbines in the space between them. The function of the bars is to allow the thin material, attached to them, to assume a curved configuration substantially in the form of a quarter cylinder. The apparatus is equipped with wind speed monitoring devices, and power source and power transmission means, such as cable-pulleys, chain-sprockets, gears, or mechanical linkages that all work in concert to deploy or stow the thin material along the vertical rods depending to the magnitude of the prevailing wind speed. Preliminary computational fluid dynamics analyses have shown that the wind deflecting structure proposed here in amplifies the wind speed by a factor of 1.65.
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Xia, Junrong, Pan Zhao, and Yiping Dai. "Operation and Simulation of Hybrid Wind and Gas Turbine Power System Employing Wind Power Forecasting." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68824.

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Due to the intermittence and fluctuation of wind resource, the integration of large wind farms in a power grid introduces an additional stochastic component to power system scheduling. This always brings challenges to maintain the stability of power system. Integrating gas turbine units with wind farms can compensate their output fluctuation. In this paper, a methodology for the operation scheduling of a hybrid power system that consists of a large wind farm and gas turbine units is presented. A statistical model based on numerical weather prediction is used to forecast power output of the wind farm for the next 24 hours at quarter-hour intervals. Forecasts of wind power are used for optimizing the operation scheduling. In order to study the dynamic performance of the proposed hybrid power system, dynamic modeling of this hybrid power system is addressed. Wind farm and gas turbine units are integrated through an AC bus, and then connected to a power grid. An aggregated model of the wind farm and detailed models of gas turbine units are developed, and are implemented using MATLAB/Simulink. Simulation studies are carried out to evaluate the system performance using real weather data. The simulation results show that the proposed hybrid power system can compensate fluctuating wind power effectively and make wind power more reliable.
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Ruggeri, Robert, Darin Arbogast, and Richard Bussom. "Wind Tunnel Testing of a Lightweight One-Quarter-Scale Actuator Utilizing Shape Memory Alloy." In 49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
16th AIAA/ASME/AHS Adaptive Structures Conference
10t. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2279.

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Li, Saili, Yiping Dai, Maoqing Li, and Lin Gao. "Modeling and Simulation of Micro-Grid System Coupled With Small Wind Turbine." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95379.

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Wind energy has been examined as a clean and economic resource, however, the intermittent and fluctuate feature of which makes it necessary to couple with an energy storage system for compensating the wind energy curtailments. A micro-grid with a compressed air energy storage (CAES) system may help to eliminate the problem resulted from high wind power penetration in the power grid. What is more, it can reduce the network losses. A micro-grid system coupled with small wind turbine presented in this paper. Off-peak power from the wind turbine is used to drive the compressor which serves for the storage vessel. The compressed air supercharges the gas turbine directly when wind energy is not sufficient to guarantee the required load. A dynamic model is built to test the behavior of the system. A statistical model based on stochastic weather data is used to simulate the output of the wind turbine for one day at quarter-hour intervals. An accurate model of CAES includes a compressor, a high pressure vessel and a gas turbine is built in details. A control system is developed to achieve outstanding system’s characteristics like great control performance, stable operation and fast starting. The simulation results show that the CAES can compensate the wind turbine and make the most of wind energy.
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Ulazia, Alain, and Gabriel Ibarra-Berastegi. "Study of ocean and wind energy potential with R: an innovative experience in the classroom." In HEAd'16 - International Conference on Higher Education Advances. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/head16.2016.2421.

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Abstract The Engineer School of Eibar initiated the Grade of Engineering in Renewable Energies four years ago. This pioneering educational project has shown many challenges to the teachers of the new grade. Among the different software skills used in this project, R programming language has been a very important one because of its capacity for spatio-temporal analysis and graphical visualization of wind energy and wave energy potential. A quarter of the subject's program in Wind Energy and Ocean Energy has been used via Problem Based Learning for the application of statistical calculus with R. The aim of this contribution is to show some paradigmatic problems solved by the students and the results obtained. Finally, the opinion of the students about the use of R and its learning potentiality have been gathered and analysed.
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Bianchini, Alessandro, Francesco Balduzzi, Giovanni Ferrara, and Lorenzo Ferrari. "Influence of the Blade-Spoke Connection Point on the Aerodynamic Performance of Darrieus Wind Turbines." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57667.

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The assessment of robust CFD techniques is casting new light on the aerodynamics of airfoils rotating around an axis orthogonal to flow direction, with particular reference to flow curvature effects and stall mechanisms. In particular, Darrieus wind turbines’ designers are taking profit from these new discovers to improve the aerodynamic design of the rotors, in view of an increase of the overall efficiency and a reduction of the structural stresses on the blades. A controversial design parameter for Darrieus turbines, especially in case of small-size rotors, is represented by the location of the blade-spoke connection along the chord. The most common solution is indeed to place the connection at approximately airfoil’s quarter chord, i.e. where the pressure center is commonly located for low incidence angles. In some cases, however, the blade is connected at middle chord due to symmetry or aesthetic reasons. In some small turbines, innovative designs have even disregarded this parameter. Even if one can argue that the blade connection point is about to have some aerodynamic effects on the turbine’s performance, the real impact of this important design parameter is often not fully understood. The present study makes use of extensive CFD simulations on a literature case study, using a NACA 0021 airfoil, to assess the influence of the blade-spoke connection point. In particular, the differences in terms of power coefficient curve of the turbine, optimal tip-speed ratio, torque profiles and stresses on the connection are analyzed and discussed. Detailed flow analyses are also shown for azimuthal positions of particular interest. Results on the selected case study showed that the middle-chord blade-spoke connection point seems to guarantee a higher performance of the rotor, even if additional solicitation is applied to the connection itself. It is further shown that the same performance can indeed be obtained with the airfoil attached at quarter chord and properly pitched. By doing so, the stresses are contained and the performance is maximized.
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Soltani, M. R., and M. Mahmoudi. "Experimental Investigation of Velocity Profiles in the Wake of an Oscillating Airfoil." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37440.

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A series of experiments were carried out to study the unsteady wakes behind an oscillating airfoil. The airfoil is a section of a wind turbine blade oscillating in pitch about the quarter chord axis at various reduced frequencies, oscillation amplitude and mean angles of attack. Real time velocity profiles were obtained using total and static pressure at 35 vertically aligned points behind the airfoil via two similar rakes. The rakes were located at a distance of 1.5 chord length behind the model. The results show great influence of oscillation amplitude and reduced frequency on the wake velocity profiles.
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Meehan, Colin, Michael Webber, and Kazunori Nagasawa. "The Net Impact of Wind Energy Generation on Emissions of Carbon Dioxide in Texas." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91217.

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This analysis will examine the relationship between increased levels of wind energy generation and emissions per unit of electricity produced using historical data for electricity output and CO2, SO2 and NOx emissions in the Electric Reliability Council of Texas (ERCOT). Renewable Portfolio Standards (RPS) are generally seen in part as a policy tool for reducing overall system CO2 emissions, although renewable energy goals do not directly regulate such emissions. Limiting this analysis to ERCOT provides two important advantages: transmission of wind energy output is constrained by the physical boundaries of the ERCOT grid, simplifying the analysis and avoiding associated ‘leakage issues’; and ERCOT has the highest level of wind generation as a percentage of total system demand of any grid in the continental U.S. The intermittent nature of wind generation has resulted in the need to ramp conventional thermal generation up and down to compensate for variability in wind output. Such ramping leads to inefficiencies in many fossil-fueled power plants that increase emissions of CO2, SO2, and NOx relative to a respective unit’s peak efficiency emissions rate. Using EPA’s Clean Air Markets hourly emissions data, we calculate the total combustion emissions of CO2, SO2 and NOx per MWh of electricity output for the ERCOT system from 2003–2011. The EPA database includes CO2, SO2 and NOx emissions reported by facility owner and operators on an hourly basis in a manner that incorporates facility inefficiencies during ramping periods, allowing us to fully evaluate the CO2 emissions reductions achieved in ERCOT as a result of increased wind generation. The study is ongoing as we wait for emissions statistics from the final quarter of 2011 to be released by the EPA in early 2012.
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Reich, Alton, Steve Doherty, and Keith Williams. "Implementation of Load Reducing Bushings for Valves in a High Vibration Environment." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61151.

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The Arnold Engineering Development Center (AEDC) testing complex includes more than 50 wind tunnels, test cells, arc heaters, and other specialized test facilities. Of these, 27 units have capabilities that are unmatched in the United States, and 14 are unmatched in the world. These unique facilities create equally unique operating environments for instrumentation used for monitoring and control of test conditions. Several high flow-rate, supersonic wind tunnels utilize off-the-shelf angular displacement transducers (ADTs) for monitoring the position of 90° valves (i.e. butterfly valves) used to control the air flow-rate, operating pressure, and temperature during testing. There are significant structural vibrations in the wind tunnels to which the ADTs are subjected. These ADTs have experienced an unacceptably high rate of failure during testing. These failures increase maintenance costs, and in some cases can require test operations be suspended while the faulty ADT is replaced; leading to significant cost and schedule impacts associated with the down-time. This paper discusses the final phase of a multi-year effort to develop and field a vibration reducing bushing assembly for use on quarter turn valves used for flow control on wind tunnels at Arnold Enginnering Development Center. The focus of the final phase was on adapting the solution that was tested in the laboratory and field to fit the various valve geometries and conditions found in the installations. Design challenges and solutions are discussed.
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Reports on the topic "Wind quartets"

1

Elgar, Steve. Improved Paramerizations of Triad and Quartet Interactions in Spectral Wind-Wave Models. Fort Belvoir, VA: Defense Technical Information Center, November 2001. http://dx.doi.org/10.21236/ada390543.

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Pedersen, Gjertrud. Symphonies Reframed. Norges Musikkhøgskole, August 2018. http://dx.doi.org/10.22501/nmh-ar.481294.

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Symphonies Reframed recreates symphonies as chamber music. The project aims to capture the features that are unique for chamber music, at the juncture between the “soloistic small” and the “orchestral large”. A new ensemble model, the “triharmonic ensemble” with 7-9 musicians, has been created to serve this purpose. By choosing this size range, we are looking to facilitate group interplay without the need of a conductor. We also want to facilitate a richness of sound colours by involving piano, strings and winds. The exact combination of instruments is chosen in accordance with the features of the original score. The ensemble setup may take two forms: nonet with piano, wind quartet and string quartet (with double bass) or septet with piano, wind trio and string trio. As a group, these instruments have a rich tonal range with continuous and partly overlapping registers. This paper will illuminate three core questions: What artistic features emerge when changing from large orchestral structures to mid-sized chamber groups? How do the performers reflect on their musical roles in the chamber ensemble? What educational value might the reframing unfold? Since its inception in 2014, the project has evolved to include works with vocal, choral and soloistic parts, as well as sonata literature. Ensembles of students and professors have rehearsed, interpreted and performed our transcriptions of works by Brahms, Schumann and Mozart. We have also carried out interviews and critical discussions with the students, on their experiences of the concrete projects and on their reflections on own learning processes in general. Chamber ensembles and orchestras are exponents of different original repertoire. The difference in artistic output thus hinges upon both ensemble structure and the composition at hand. Symphonies Reframed seeks to enable an assessment of the qualities that are specific to the performing corpus and not beholden to any particular piece of music. Our transcriptions have enabled comparisons and reflections, using original compositions as a reference point. Some of our ensemble musicians have had first-hand experience with performing the original works as well. Others have encountered the works for the first time through our productions. This has enabled a multi-angled approach to the three central themes of our research. This text is produced in 2018.
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Tu, P., and T. Forsyth. Field Verification Program for Small Wind Turbines, Quartelry Report: 2nd Quarter, Issue No.1, October 2000. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/767310.

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Cardinal, J., and P. Tu. Field Verification Program for Small Wind Turbines, Quarterly Report: 3rd Quarter, Issue No.2, July-September 2000. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/783416.

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Author, Not Given. Field Verification Project for Small Wind Turbines, Quarterly Report, October-December 2001, 4th Quarter, Issue No.7. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/15014841.

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Forsyth, T., and J. Cardinal. Field Verification Program for Small Wind Turbines: Quarterly Report for January-March 2001; 1st Quarter, Issue No.4. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/789467.

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Cardinal, J. Field Verification Program for Small Wind Turbines: Quarterly Report for October-December 2000; 4th Quarter, Iss. No.3. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/786302.

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NY/NJ Distributed Wind Power Field Verification Project. Quarterly Report for the 2nd Quarter 2000. Office of Scientific and Technical Information (OSTI), July 2000. http://dx.doi.org/10.2172/763306.

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Field Verification Project for Small Wind Turbines, Quarterly Report: April - June 2001; 2nd Quarter, Issue No.5. Office of Scientific and Technical Information (OSTI), April 2002. http://dx.doi.org/10.2172/15000204.

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